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Related Experiment Videos

Doxazosin, a case history.

S F Campbell1, M J Davey

  • 1Pfizer Central Research, Sandwich, Kent.

Drug Design and Delivery
|August 1, 1986
PubMed
Summary
This summary is machine-generated.

Researchers identified the structural basis for prazosin

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Area of Science:

  • Pharmacology
  • Medicinal Chemistry

Background:

  • Prazosin's antihypertensive effect is due to blockade of postjunctional alpha 1-adrenoceptors.
  • Structural elucidation of alpha 1-adrenoceptor antagonists is crucial for developing new antihypertensive drugs.

Purpose of the Study:

  • To identify the pharmacophore responsible for alpha 1-adrenoceptor recognition.
  • To explore structure-activity relationships (SARs) for novel quinazoline derivatives.
  • To develop long-acting alpha 1-adrenoceptor antagonists for hypertension management.

Main Methods:

  • Structure-activity relationship (SAR) analysis of quinazoline derivatives.
  • Pharmacological evaluation of novel quinazoline-benzodioxanoyl compounds.
  • Assessment of antihypertensive activity and duration of action in preclinical models.

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Main Results:

  • The 2,4-diamino-6,7-dimethoxyquinazoline moiety was identified as the pharmacophore for alpha 1-adrenoceptor recognition.
  • Modification of the quinazoline 2-substituent impacts receptor affinity and duration of action.
  • Doxazosin, a novel derivative, demonstrated potent, selective, and long-lasting alpha 1-adrenoceptor antagonism with minimal heart rate effects.

Conclusions:

  • The 2,4-diamino-6,7-dimethoxyquinazoline structure is key for alpha 1-adrenoceptor blockade.
  • Doxazosin represents a promising therapeutic agent for hypertension due to its sustained efficacy and favorable safety profile.
  • Once-daily administration of doxazosin provides 24-hour blood pressure control in humans.